Can anyone confirm its a duff thermocouple on my New World cooker please?

I have a New World Plan 6 cooker. The problem is that when I light the oven, the spark plugs keep clicking away until the oven reaches temperature. If I want to lower the temperature, I have to open the door to allow heat to escape to stop the sparking. I believe it could be the thermocouple, but confirmation and any idea of a place to get a new one.(the cooker is not that young), would be great. Thanks
Dave, November 2008
Thank you Tony. At least I can get thermocouples out of the deal now. Have oven on low (3) now, and it just started clicking then stopped again. Must know I on to it.:-). Will check connections and HT lead.Thank you again

Dave, November 2008
Definitely not a t/couple problem Dave.The spark ignition is supposed to stop when the flame is lit thro a sensor in the oven.This sensor is not picking up a flame hence the continous sparking.It could be a faulty H/T lead not sending a signal back to the ign unit.Make sure all connections are clean also.

Tony S, November 2008
link Click here to see other fixes for New World.